American scientists wrote in the latest issue of Nature Chemistry that they found that the impure graphene that appears after the reduction reaction of graphene oxide can be made more pure by adding hydrogen to it to better Give full play to the characteristics of graphene.
Graphene is a two-dimensional crystal composed of only one layer of carbon atoms. Ultra-thin graphene has huge application potential and can replace the current liquid crystal display materials. Compared with silicon, an important raw material for electronic products such as computers and mobile phones, Graphene also has many advantages, and it is expected to replace silicon in the future, and it will show its strength in the field of electronic products and solar cells.
Professor of the Engineering Department of Brown University in the United States, Vivko Schenoni, said that despite the great potential of graphene application, people know very little about its and its derivatives, and the more you understand the characteristics of graphene, the better you can develop it potential.
Currently, one of the methods for preparing graphene is to obtain graphene by subjecting graphene oxide to a reduction reaction. The graphene sheet thus obtained is a two-dimensional honeycomb structure, although most of them are carbon atoms, but also intertwined with oxygen atoms and hydrogen atoms, greatly destroying the purity of the graphene sheet.
If sufficient heat is applied to the obtained graphene oxide, oxygen atoms and hydrogen atoms will be combined, and water will be separated from the graphene. But some oxygen atoms are very stubborn and will stay in the honeycomb lattice structure, destroying its purity.
Shenloni, in collaboration with researchers at Rutgers University and the University of Texas at Dallas, used molecular dynamics simulation methods to study the atomic configuration of graphene. They found that those "stubborn" oxygen atoms formed with carbon atoms. The double bond, as a very stable arrangement, will create irregular small holes in the graphene honeycomb lattice. These oxygen atoms are "very low in energy and almost react with other substances, making it difficult to leave the graphene grid".
Based on this, the researchers believe that adding hydrogen atoms is the best way to further reduce graphene oxide. One method is to add a hydrogen atom where the oxygen atom forms a double bond with the carbon atom to make the hole bigger. The hydrogen atom and the oxygen atom will pair to form a hydroxyl group, leaving the graphene lattice, which is equivalent to making the hole disappear; The method is to add hydrogen in the place where the hydroxyl group is formed, and let the oxygen atoms leave the graphene in the form of water, making the graphene more pure.
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